Die-casting machine



2 Sheets-Sheet 1 v el /t0;

E. THIESLACK D IE CASTING MACHINE Filed May 18 1925 Dec. 21,1926. 1

E. THIESLACK DIE CAST ING MACHINE,

Filed May 18, 1925 2 Sheets-Sheet. 2

Patented Dec. 121', 1926. i

umrnnsrArss PATE OFFICE.

EMIL THIESiLACK, OF BERLIN, GERMANY.

mn-qns'rme neonmn,

Application tiled May'18, 1925, Serial N9.

Myi invention relates to die-casting machines and more especially tomachines equipped with a ladle to receive the molten metal from which itis ejected, by compressed air.

Die-casting machines have already been proposed in which the ladle isadapted to be tilted about a vertical axis so that in one of its finalpositions it is immersed in, and charged with, the molten metal, and inthe other positionit is connected to the injection nozzle so that themetal is forced into theladle by the compressed air admitted throughsaid nozzle. It hasalso been proposed to construct ladles which are notonly adapted to be tilted about an axis but also to be displaced bodilywhile in the crucible.

These known machines involve {the drawback that the, tilting motion isnot always performed satisfactorily as often the operation of the ladleis interfered-with or prey vented by adhering molten metal.

' sides of the machine frame.

drive, the rack being pivoted to the ladle at the ladle being carried onpins which may be provided with rollers to reduce friction,

and are guided in slots of two plates at the The ladle is preferablyactuated by a rack and pinion one end and supported on a stationary pinon which it may slide and about'which itv may rock. I l

The rack and pinion gear permits the ladle to be operated with a minimumof power and molten metal adhering to-the guiding faces of the slotsdoes not interfere with the operation of the ladle as the pins orrollers on which the ladle is moving'haveso much play in the slots thatsmall accumulations of molten and hardened "metal do .not arrest;

their progress.

In machines of this kind it is also very important to prevent?unintentional operation of the valve for the compressed air and 31,182,and in Germany October 17, 1924.

that the connection between the inlet and outlet fort the compressed airshould be positive. I 1 v The first condition is fulfilled by providmgan automatic release in connection with the operating handle of the airinlet valve, the handle being disengaged from the valve spindle afterthe valve has been lifted from its seat to admit air for a castmg andcon nected therewith only when the next casting is to be made. When thehandle has been so disengaged, unintentional operation of the lever isnot able to open the air'inlet valve so that the accidents are avoidedwhich are often eausedby operation of the inlet valve out of time.

The groove for discharging compressed air is preferably milled into thevalve spindle which greatly simplifies the construction.

In the drawings, a machine embodying my {invention is illustrated bywayf example.

Figure 1 is an elevation of. the ladle, part-- 80 ly in section,

Figure 2 is an elevation valve, also partly in section,

: Figures 3 and 4; are detail views illustratof the air inlet ingmodified connections of the handle for operating the air inlet valve,with said valve.

. Referring .now to the drawings, .1 is the "crucible containing themolten metal which is heated by any suitable furnace, not shown.

2 is the ladle and 3, 3 are pins. secured to the upper portion of saidladle. are adapted to move in grooves 4, 4' of two lateral plates 5which are secured to the.

frame, not shown, of the machine. It will be understood that only one ofthese plates is visible in the drawings. A rack 7 is piv- 'oted about 8in which a pinion 9-with a crank 10 is arranged and adapted to mesh with,said rack 7. Y 1

In the position shown in full lines in Fig- .ure 1, thev ladle 2isimmersed in the crucible land is charged wlth molten metal. -When theladle has been c'ha'rged. the crank 10 is rotated and the ladle ispushed upwards on the grooves 4, 4? by means ,of the reel: 7, as

shown in dot-and-dash lines in Figure 1.

In this osition, the ladle is tightly connected to the die, notshown-and the molten metal may be ejected by the compressed airanysuitable consupplied to the pipe 11 by nection, not shown, from a pipe14'.

The pins a pin 6 at the end of the ladle" and supported on a check 8 inan uprightspindle 15 is connected with the operating 19 1s a lever 17 bymeans of a pawl'23. spiral spring tending to hold the valve body 13 onits seat. 20 is :1 lug on the valve spindle which cooperates with twoslots 21 in the wall ofthe sleeve in which the spindle 15 is guided.

The operation of my machine is as follows: {By depressing the lever 17against the action of the spring 19 compressed air is admitted to thepipe 11 of the ladle 2 and the molten metal is ejected. On its downwardmotion, the connection of the lever with the spindle 15 is released bythe lug 20 and the slot 21. Only when the lever 17 is returned to itsupper end position its connection with the spindle 15 is re-establishedby the laminated spring 18. Y

In the position of the valve 13 shown in Figure 2, the air from the pipe12 is discharged through the groove 16. It will appear that when thevalve 13 is open the groove 16 becomes inoperative, as in this positionit is not connected with atmosphere.

Modifications of the automatic release ofi the lever 17 areshown by wayof example valve in Figures 3 and 4.. It will appear from these figuresthat the spindle .15 of the valve 13 is connected with the lever '17 bymeans of a pawl 23 which is hinged to a disc 24 at the top of thespindle 15. When 2. lug 25 at the lever 17 and a lug 26 of the pawl23'are in positive engagement the spindle 15 will be moved downwards.When the spindle is at 'the lower end of its stroke the lugs 25 and 2eare disengaged by corresponding lateral dlsplacementi of ,Ithepawl 23 sothat the cannot be operated accidentally. ,Su'ch operation 1s onlypossible after the lever 17 has resumed its upper end position.

In the modification shown in Figure 4 the lever 17 engages a groove 17of the pawl 23 and the connection between the two parts is broken by acam 27 when the valve has attained the lower end of its stroke.

It should benoted that with the 'novel type of ladle shown and describedand by the way in which it is handled the. access of oxide to the die isabsolute y prevented. Only pure and oxide-free metal can get into thedie.

The formation of small quantities of oxide .be lifted on the surface ofthe-molten metal in the crucible is inevitable. In the existingdiecasting machines in which the ladle 1s moved slowly throughthe'surface of themolten metal oxide will often get into the ladle. Bymeans-of the drive'shown in Figure 1,

the ladle is rapidly immersed into the molten metah'so that no oxide canget into it. On the contrary, it is charged with pure metal below thesurface and the entrance of impurities is absolutely prevented.

I claim: 1

posed pairs of inclined guides for slidably supporting the ladle so thatthe ladlemay and lowered thr6i1gh the guides to a position projectingoutwardly from the ladle or 1n a submerged position within the ladle,and actuating means operatively connected; with the inner end of theladle for impartin sliding movement to the ladle.

' 2. A ie castmg frame, a crucible, a ladle adapted to be charged withmolten material in said crucible, opposed parallel inclined guides forsaid ladle on the frame, means for imparting a machine including a' 1.In a die-casting machine a lable, op-

sliding movement to the ladle to effect a lifting of the ladle along theguides to a position above the crucible and for lowering the ladle intothe crucible.

3. A die-casting machine including a frame, a crucible for, containingmolten metal, a ladle adapted to be chargedwith molten metal in saidcrucible, opposed pairs of trunnions projecting from the ,ladle theframe being provided with opposed pairs of parallel guide ways inclinedupwardly toward the front end of the crucible and terminatingin'horizontal portions' for accom modating the trunnions to effectsupporting of the ladle, and means far imparting a sliding movement tothe ,ladle' so that it may be elevated along the guide ways withoutbeing tilted to a 'pos1tion for discharging the contents or lowering itinto a submerged position within the crucible.

4. A die-casting machine as claimed in I claim 3, wherein the means forimparting a sliding movement to the ladle includes a pinion supported inan elevated position,.a rack having one end pivoted to the ladle, a lugpositioned slightly beneath the pinion for ensuring of the meshing ofthe rack with the pinion, and means for rotating the pinion to move therack and the ladle, substantially as and for the purposes set forth.

. 5. A die-casting machine including a frame, a crucible adapted tocontain molten I metal, a ladle adapted to be charged with molten metalin the crucible, a frame including opposed pairs of upwardly and for--wardly inclined guideways' arranged parallel to each other and havingthe upper portions extending in substantial alignment with, each other;opposed trunnions projecting outwardly from the opposite sides of theladle and slidably engage Withthe guideways so that Whenshding movement;is imparted to the ladle the latter will be lifted i 'upwardly from thesubmerged position into a position of rest in the upper portions of theguideways so that the contents may be eject d therefrom, and means forimpart" a sliding movement to the ladle includin g i slidably androckably mounted rack pivot- 10 ally connected to the, ladle. Intestimony whereof, I have signed my name to this specification.

EMIL THIESLACK.

